Highlighter pen



FIG. 1 is a right side and top perspective view of a highlighter pen showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational view thereof, the right side being the mirror image thereof;

FIG. 4 is a view similar to FIG. 1 showing the cap removed;

FIG. 5 is a view similar to FIG. 2 showing the cap removed;

FIG. 6 is a view similar to FIG. 3 showing the cap removed;

FIG. 7 is a top plan view; and,

FIG. 8 is a bottom plan view.

The stippling shown in the drawings illustrates texture, and forms a part of the claimed design. 

The ornamental design for a highlighter pen, as shown and described. 